/*
*
* This file was created by Paul Johnston, and information about this code and how it works
* can be found on his site: http://pajhome.org.uk/crypt/md5/
* The site is an excellent resource for building an understanding of how exactly
* the Challenge Hash authenticatin scheme works.
*/

/**

 Copyright (c) 1998 - 2002, Paul Johnston & Contributors
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
 the following disclaimer in the documentation and/or other materials provided with the distribution.

 Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived
 from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


var MD5 = {};
(function()
{
/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */

this.hexcase = 0;
/* hex output format. 0 - lowercase; 1 - uppercase        */
this.b64pad = "";
/* base-64 pad character. "=" for strict RFC compliance   */
this.chrsz = 8;
/* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
this.hex_md5 = function( s )
{ return this.binl2hex(core_md5(str2binl(s), s.length * chrsz));}
this.b64_md5 = function( s )
{ return this.binl2b64(core_md5(str2binl(s), s.length * chrsz));}
this.str_md5 = function( s )
{ return this.binl2str(core_md5(str2binl(s), s.length * chrsz));}
this.hex_hmac_md5 = function( key, data )
{ return this.binl2hex(core_hmac_md5(key, data)); }
this.b64_hmac_md5 = function( key, data )
{ return binl2b64(core_hmac_md5(key, data)); }
this.str_hmac_md5 = function( key, data )
{ return this.binl2str(core_hmac_md5(key, data)); }

/*
 * Perform a simple self-test to see if the VM is working
 */
this.md5_vm_test = function()
{
    return this.hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
this.core_md5 = function( x, len )
{
    /* append padding */
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;

    var a = 1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d = 271733878;

    for ( var i = 0; i < x.length; i += 16 )
    {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;

        a = this.md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
        d = this.md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
        c = this.md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
        b = this.md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
        a = this.md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
        d = this.md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
        c = this.md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
        b = this.md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
        a = this.md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
        d = this.md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
        c = this.md5_ff(c, d, a, b, x[i + 10], 17, -42063);
        b = this.md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
        a = this.md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
        d = this.md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
        c = this.md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
        b = this.md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

        a = this.md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
        d = this.md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
        c = this.md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
        b = this.md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
        a = this.md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
        d = this.md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
        c = this.md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
        b = this.md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
        a = this.md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
        d = this.md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
        c = this.md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
        b = this.md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
        a = this.md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
        d = this.md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
        c = this.md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
        b = this.md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

        a = this.md5_hh(a, b, c, d, x[i + 5], 4, -378558);
        d = this.md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
        c = this.md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
        b = this.md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
        a = this.md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
        d = this.md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
        c = this.md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
        b = this.md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
        a = this.md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
        d = this.md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
        c = this.md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
        b = this.md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
        a = this.md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
        d = this.md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
        c = this.md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
        b = this.md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

        a = this.md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
        d = this.md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
        c = this.md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
        b = this.md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
        a = this.md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
        d = this.md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
        c = this.md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
        b = this.md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
        a = this.md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
        d = this.md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
        c = this.md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
        b = this.md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
        a = this.md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
        d = this.md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
        c = this.md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
        b = this.md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

        a = this.safe_add(a, olda);
        b = this.safe_add(b, oldb);
        c = this.safe_add(c, oldc);
        d = this.safe_add(d, oldd);
    }
    return Array(a, b, c, d);

}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
this.md5_cmn = function( q, a, b, x, s, t )
{
    return this.safe_add(bit_rol(safe_add(safe_add(a, q), this.safe_add(x, t)), s), b);
}
this.md5_ff = function( a, b, c, d, x, s, t )
{
    return this.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
this.md5_gg = function( a, b, c, d, x, s, t )
{
    return this.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
this.md5_hh = function( a, b, c, d, x, s, t )
{
    return this.md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
this.md5_ii = function( a, b, c, d, x, s, t )
{
    return this.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
this.core_hmac_md5 = function( key, data )
{
    var bkey = str2binl(key);
    if ( bkey.length > 16 ) bkey = core_md5(bkey, key.length * chrsz);

    var ipad = Array(16), opad = Array(16);
    for ( var i = 0; i < 16; i++ )
    {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }

    var hash = this.core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
    return this.core_md5(opad.concat(hash), 512 + 128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
this.safe_add = function( x, y )
{
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
this.bit_rol = function( num, cnt )
{
    return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
this.str2binl = function( str )
{
    var bin = Array();
    var mask = (1 << chrsz) - 1;
    for ( var i = 0; i < str.length * chrsz; i += chrsz )
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);
    return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
this.binl2str = function( bin )
{
    var str = "";
    var mask = (1 << chrsz) - 1;
    for ( var i = 0; i < bin.length * 32; i += chrsz )
        str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);
    return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
this.binl2hex = function( binarray )
{
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var str = "";
    for ( var i = 0; i < binarray.length * 4; i++ )
    {
        str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
               hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8  )) & 0xF);
    }
    return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
this.binl2b64 = function( binarray )
{
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    for ( var i = 0; i < binarray.length * 4; i += 3 )
    {
        var triplet = (((binarray[i >> 2] >> 8 * ( i % 4)) & 0xFF) << 16)
            | (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8 )
            | ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
        for ( var j = 0; j < 4; j++ )
        {
            if ( i * 8 + j * 6 > binarray.length * 32 ) str += b64pad;
            else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
        }
    }
    return str;
}

/*
*  Create the authentication code based on the the standard format for a
*  JAAS login Form (require a name field with id='j_username' and a
*  password field with id='j_password').
*  Requires the ElementID strings for the form, the salt and the challenge.
*  The salt and the challenge should populate hidden form fields.
*  The form will be submitted by this function, after modifying the
*  password field to contain the authCode, rather than the actual user's
*  password.
*  @author Geoff Granum
*/
this.createAuthCode = function( formElId, saltElId, challengeElId )
{
    //id="" onSubmit="createAuthCode()" method=post action="../user/j_security_check" >
    this.frm = document.getElementById(formElId);
    this.salt = document.getElementById(saltElId);
    this.nm = document.getElementById("j_username");
    this.pwd = document.getElementById("j_password");
    this.challenge = document.getElementById(challengeElId);

    this.hash = this.hex_hmac_md5(pwd.value, nm.value + salt.value);

    this.hash2 = this.hex_hmac_md5(hash, challenge.value);
    pwd.maxLength = 250;
    pwd.value = challenge.value + ":" + hash2;
    frm.action = "../user/j_security_check";
    frm.method = "post";
    frm.submit();
}

}).apply(MD5);